"Recensement du Canada de 1911," database, FamilySearch (https://familysearch.org/pal:/MM9.1.1/27X8-R66 : 2 March 2015), Ethel Smith in entry for Albert Smith, 1911; citing Census, Wentworth Sub-Districts 16-55, Ontario, Canada, Library and Archives of Canada, Ottawa, Ontario; FHL microfilm 2,418,535.
"Ontario Deaths, 1869-1937 and Overseas Deaths, 1939-1947," database with images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JKXP-JH6 : 11 December 2014), Edna Ethel Smith, 30 Oct 1933; citing East Flamborough, , Ontario, 035459, Archives of Ontario, Toronto; FHL microfilm 2,358,847.
It may be possible to confirm family relationships with Ethel by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Ethel: